Fluid handling – Back flow prevention by vacuum breaking – Air vent in liquid flow line
Patent
1980-04-08
1982-03-30
Michalsky, Gerald A.
Fluid handling
Back flow prevention by vacuum breaking
Air vent in liquid flow line
137107, 137312, 137513, 13751625, 1375278, 137544, 137584, F16K 2400
Patent
active
043219420
ABSTRACT:
A backflow preventer valve including a housing structure having inlet and outlet ports therethrough for attaching to system conduits, a chamber formed in the housing, a pair of spaced valve seats associated with one of the ports including a space formed between the valve seats, a movable valve assembly including a first member hingedly attached to the valve housing structure for movement in the chamber between a closed position adjacent to the valve seats and an open position angularly related to the closed position, the valve assembly having a clapper portion defined by relatively movable inner and outer members, a flexible valve member including first and second portions and separate members for attaching the flexible valve member respectively to the inner and outer clapper members, the first portion of the flexible valve member being engageable with one of the pair of spaced valve seats in the closed position thereof and the second portion being engageable with the other of the pair of valve seats in the closed position thereof, and a discharge port communicating the space formed in the valve housing structure by and between the pair of spaced valve seats with atmospheric conditions. The subject valve may also optionally include a discharge valve assembly associated with the discharge port to control communication therethrough.
REFERENCES:
patent: 2654388 (1953-10-01), Glass
patent: 3171423 (1965-03-01), Dillon
patent: 3785397 (1974-01-01), Young
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